This document consists of 5 printed pages summarizing the requirements and marking scheme for the Cambridge International General Certificate of Secondary Education Chemistry 0620/63 exam on alternative practical assessment from October/November 2016. It provides the answers required to score marks on the exam and shows the basis for how examiners were instructed to award marks.

1. ® IGCSE is the registered trademark of Cambridge International Examinations.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
This document consists of 5 printed pages.
© UCLES 2016 [Turn over
Cambridge International Examinations
Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/63
Paper 6 Alternative to Practical October/November 2016
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the
examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the
details of the discussions that took place at an Examiners’ meeting before marking began, which would have
considered the acceptability of alternative answers.
Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for
Teachers.
Cambridge will not enter into discussions about these mark schemes.
Cambridge is publishing the mark schemes for the October/November 2016 series for most
Cambridge IGCSE®
, Cambridge International A and AS Level components and some Cambridge O Level
components.

2. Page 2 Mark Scheme Syllabus Paper
Cambridge IGCSE – October/November 2016 0620 63
© UCLES 2016
Question Answer Mark
1(a) (clamp/retort) stand
trough
1
1
1(b) to absorb/hold/keep/soak up/contain the paraffin oil 1
1(c) M1 bromine (aqueous/in cyclohexane)
M2 turns colourless/decolourised
1
1
1(d) to prevent suck back (of water) 1

3. Page 3 Mark Scheme Syllabus Paper
Cambridge IGCSE – October/November 2016 0620 63
© UCLES 2016
Question Answer Mark
2(a) table of results for Experiment 1
temperature boxes completed correctly
20, 20, 20, 25, 28, 31, 33, 34, 35, 36, 36
2
2(b) table of results for Experiment 2
temperature boxes completed correctly
22, 22, 22, 71, 76, 75, 72, 70, 67, 65, 64
2
2(c) all points correctly plotted ± half a small square
smooth line graphs
labelled
2
1
1
2(d)(i) working shown clearly as construction lines or cross
value from graph (29–30°C±0.5°C)
1
1
2(d)(ii) value from graph (72s)
–60s
1
1
2(e) room temperature or initial temperature from table (20–22°C)
reaction has finished/stopped
1
1
2(f) more readings/points/data
smoother curve/better or more accurate graph
1
1
2(g) polystyrene is an insulator/copper is a (good) conductor
reduced heat losses
1
1

4. Page 4 Mark Scheme Syllabus Paper
Cambridge IGCSE – October/November 2016 0620 63
© UCLES 2016
Question Answer Mark
3(a)(i) pH 1–3 1
3(a)(ii) effervescence/fizzing/bubbling/solid disappears/dissolves
lighted splint
‘pops’
1
1
1
3(a)(iii) effervescence/fizzing/bubbling/solid disappears/dissolves
limewater
milky
1
1
1
3(a)(iv) white precipitate 1
3(b) calcium/Ca2+
hydroxide/OH–
1
1

5. Page 5 Mark Scheme Syllabus Paper
Cambridge IGCSE – October/November 2016 0620 63
© UCLES 2016
Question Answer Mark
4
silica
filter (the cleaner)
wash the residue
dry the residue
water
heat (the filtrate/cleaner)
condense the vapour
sodium carbonate
heat to dryness/no liquid left
(then solid) sodium carbonate is left
OR
heat until saturated
then cool to crystallise/leave to crystallise
6